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Basic and Diluted Earnings Per Share | 12 Months Ended
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May. 31, 2015
Earnings Per Share [Abstract] |
Basic and Diluted Earnings Per Share | Basic and Diluted Earnings Per Share Basic and diluted earnings per share were calculated as follows:
|  | Year ended May 31,
In millions, except per share amounts |  | 2015 |  | 2014 |  | 2013
Basic earnings per share: |  |  |  |  |  |
Net income |  | $ | 674.9 |  |  | $ | 627.5 |  |  | $ | 569.0 |
Weighted-average common shares outstanding |  | 362.9 |  |  | 364.5 |  |  | 363.8 |
Basic earnings per share |  | $ | 1.86 |  |  | $ | 1.72 |  |  | $ | 1.56 |
Diluted earnings per share: |  |  |  |  |  |
Net income |  | $ | 674.9 |  |  | $ | 627.5 |  |  | $ | 569.0 |
Weighted-average common shares outstanding |  | 362.9 |  |  | 364.5 |  |  | 363.8 |
Dilutive effect of common share equivalents |  | 1.7 |  |  | 1.6 |  |  | 0.9 |
Weighted-average common shares outstanding, assuming dilution |  | 364.6 |  |  | 366.1 |  |  | 364.7 |
Diluted earnings per share |  | $ | 1.85 |  |  | $ | 1.71 |  |  | $ | 1.56 |
Weighted-average anti-dilutive common share equivalents |  | 0.3 |  |  | 0.7 |  |  | 6.5 |
Weighted-average common share equivalents that had an anti-dilutive impact are excluded from the computation of diluted earnings per share. In May 2014, the Company announced that its Board of Directors (the “Board”) approved a program to repurchase up to $350.0 million of the Company's common stock with authorization expiring on May 31, 2017. During fiscal 2015, the Company repurchased 3.9 million shares for $182.4 million under this program. During fiscal 2014, the Company repurchased 6.2 million shares for $249.7 million under a previous Board-approved program to repurchase up to $350.0 million of its common stock which expired on May 31, 2014. All shares repurchased were retired.

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